4.7 Article

New shielding covers based on transparent polyimide/ferrous sulfide composites that reduce optical losses in solar cells

期刊

COMPOSITES SCIENCE AND TECHNOLOGY
卷 218, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2021.109140

关键词

Polymer-matrix composites (PMCs); Interface; Atomic force microscopy (AFM); Refractive index

资金

  1. Ministry of Research, Innovation and Digitization, CNCS/CCCDI - UEFISCDI, within PNCDI III [TE 83/1.09.2020, PN-III-P1-1.1-TE-2019-1878]

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A set of new composites based on fluorinated polyimide and ferrous sulfide were prepared for use as shielding covers in solar cells. The films showed high transmittance above 77% at 500 nm with 10% ferrous sulfide, maintaining good optical clarity. The study also highlighted the temperature effect on refractive index and the hydrophobic nature of the polyimide structure, providing anti-soiling features to the composite samples.
The protective cover glass is an essential element of solar cells in superstrate configuration, determining their efficiency by means of its lightweight, flexibility, optical, morphological and interfacial properties. In this work, a set of new composites based on a fluorinated polyimide and various contents of ferrous sulfide was prepared and characterized for use as shielding covers. FTIR spectra confirmed the structure of the synthesized samples. The transmittance of the obtained films was above 77% at 500 nm at 10% ferrous sulfide, maintaining a good optical clarity upon reinforcement. The measured refraction index ranges between 1.628 (0% filler) and 1.730 (20% filler), rendering a good match with those of the adjacent ITO transparent conductive oxide, which favors reduction of the optical losses. Here is pointed out for the first time, the temperature effect in refractive index and its impact on diminishment of optical losses at interface. The fluorinated structure of the polyimide enables high hydrophobicity that removes the dew related issues, rendering anti-soiling features to the composite samples. Moreover, diffuse coplanar surface barrier discharge plasma exposure of one side of the prepared films enhances the adhesion with the neighboring conductive layer, hence induces a greater compatibility among the solar cell layers.

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